检索结果-南通市图书馆

Natural Products and Bioprospecting 2023年第1期13卷 639-649页

作者： Willy Cely-Veloza Lydia Yamaguchi Diego Quiroga Massuo j.kato Ericsson Coy-Barrera Bioorganic Chemistry Laboratory Facultad de Ciencias Básicas y AplicadasUniversidad Militar Nueva Granada250247 CajicáColombia Institute of Chemistry University of São PauloSão Paulo 05508-000SPBrazil

The Genisteae tribe belongs to the Fabaceae *** wide occurrence of secondary metabolites,explicitly high-lighting the quinolizidine alkaloids(QAs),characterizes this *** the present study,twenty QAs(1-20),including lupanine(1-7),sparteine(8-10),lupanine(11),cytisine and tetrahydrocytisine(12-17),and matrine(18-20)-type QAs were extracted and isolated from leaves of three species(i.e.,Lupinus polyphyllus(’rusell’hybrid),Lupinus muta-bilis,and Genista monspessulana)belonging to the Genisteae *** plant sources were propagated under greenhouse *** isolated compounds were elucidated by analyzing their spectroscopical data(MS,NMR).The antifungal effect on the mycelial growth of Fusarium oxysporum(Fox)of each isolated QA was then evaluated through the amended medium *** best antifungal activity was found to be for compounds 8(IC_(50)=16.5μM),9(IC_(50)=7.2μM),12(IC_(50)=11.3μM),and 18(IC_(50)=12.3μM).The inhibitory data suggest that some QAs could effi-ciently inhibit Fox mycelium growth depending on particular structural requirements deduced from structure-activity relationship *** identified quinolizidine-related moieties can be involved in lead structures to develop further antifungal bioactives against Fox.

关键词： Fabaceae Genista Lupinus Fusarium oxysporum Quinolizidines Antifungals

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

非接触式光学探测传感器

中国检验检测 1992年第6期 10-14页

作者： j.kato 何平

1.前言最近,在高精度测量轮廓和位置的领域,测量距离和位移的非接触式传感器吸引了很大兴趣。通过这些传感器采用光学方法,大多数情况下激光二极管(LD)用作为传感器的光源。然而,使用 LD 通常都是因为它有高的光强度,直至现在才有几例报... 详细信息

1.前言最近,在高精度测量轮廓和位置的领域,测量距离和位移的非接触式传感器吸引了很大兴趣。通过这些传感器采用光学方法,大多数情况下激光二极管(LD)用作为传感器的光源。然而,使用 LD 通常都是因为它有高的光强度,直至现在才有几例报道 LD 的相干特性作

关键词：光学反馈非接触式合成波长激光束聚焦探测传感器振荡模复合腔 LDI 激光二极管半导体激光器

北京清华园采暖前与采暖期PM10中有机碳与元素碳的污染特征

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

北京清华园采暖前与采暖期PM10中有机碳与元素碳的污染特征

Differential colour-ring loss among Dalmatian Pelican(Pelecanus crispus) colonies and its consequence on survival estimates

中国气象学会2003年年会

作者：杨复沫贺克斌贾英涛雷宇马永亮 S.Tanaka T.Okuda j.kato j.Mori 清华大学环境科学与工程系清华大学环境科学与工程系清华大学环境科学与工程系清华大学环境科学与工程系清华大学环境科学与工程系庆应大学化学系庆应大学化学系庆应大学化学系庆应大学化学系

＜正＞大气颗粒物中的含碳组分包括有机碳（OC）、元素碳（EC）和碳酸盐碳（CC）,其中OC与EC主要存在于较小的颗粒物如PM10之中。OC与EC并不是严格定义的实体,而是分别包含大量的有机物和功能基团。OC既可以是污染源直接排放的一次粒子... 详细信息

＜正＞大气颗粒物中的含碳组分包括有机碳（OC）、元素碳（EC）和碳酸盐碳（CC）,其中OC与EC主要存在于较小的颗粒物如PM10之中。OC与EC并不是严格定义的实体,而是分别包含大量的有机物和功能基团。OC既可以是污染源直接排放的一次粒子,也可以是有机气体在大气中转化而成的二次粒子,主要产生于燃烧、地质过程、道路尘和光化学反应等,也可产生于生物活动;EC则主要来自于化石燃料和生物质燃烧的直接排放,在大气中很稳定;CC细粒子的含量通常很小,在进行化学物种分析

关键词：大气污染物含碳颗粒物污染特征

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Avian Research 2024年第1期15卷 66-71页

作者： Anastasios Bounas Giorgos Catsadorakis Dionyssia Hatzilacou Theodoros Naziridis jocelyn Champagnon Alain j.Crivelli Department of Biological Applications and Technology University of IoanninaIoanninaGreece Society for the Protection of Prespa Agios GermanosGreece Natural Environment and Climate Change Agency 207 Mesogeion Ave.11525AthensGreece Natural Environment and Climate Change Agency Kerkini BranchKerkiniGR-62055Kato PoroiaGreece Tour du Valat Research Institute for Conservation of Mediterranean Wetlands13200ArlesFrance

The analysis of bird ringing data often comes with some potential sources of error and bias,as ring wear and/or loss could affect mark-recapture analyses and produce erroneous estimates of ***,ring wear and loss rates may differ between and within species based on the habitat they use or the species’ life-history traits and behaviour as well as the type of the *** this study we use resighting data from a long-term double marking experiment to directly estimate the rate of colour-ring loss among different Dalmatian Pelican colonies over time,evaluate any possible factors that could contribute to differential ring loss and assess how it may bias the results of mark-resighting *** on 14,849 resightings from 1275 individuals and using multi-state continuous-time hidden Markov models(HMMs) we showed that probability of ring loss was markedly different among colonies,ranging from 0.10 to 0.42 within the first year of marking,whereas the cumulative probability of losing a ring after ten years ranged 0.64 to *** rates are among the highest estimated when compared to previous studies in *** approach assessing the intra-specific variance in ring loss provided several factors potentially involved,such as the use of glue and the fledgling age accuracy and we could further hypothesise the effect of environmental ***,our results showed that ring loss can be a significant challenge for the assessment of the species’ population dynamics using mark-recapture methods as survival was consistently underestimated when not accounting for ring loss and varied significantly among different colonies.

关键词： Bias Capture-mark-recapture Colour-ring Double-marking Hidden Markov models

On a New Geometric Constant Related to the Modulus of Smoothness of a Banach Space

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第9期30卷 1526-1538页

作者： Yasuji TAKAHASHI Mikio kato Department of System Engineering Okayama Prefectural University Department of Mathematics Faculty of EngineeringShinshu University

We shall introduce a new geometric constant A（X） of a Banach space X, which is closely related to the modulus of smoothness px （T）, and investigate it in relation with the constant As （X） by Baronti et al., the von Neumann-jordan constant CNj（X） and the james constant j（X）. A sequence of recent results on these constants as well as some other geometric constants will be strengthened and improved.

关键词： Constant A(X) von Neumann-jordan constant james constant modulus of smoothness modulus of convexity uniform non-squareness

Petrology and SHRIMP zircon geochronology of granulites from Vesleknausen, Lützow-Holm Complex, East Antarctica: Neoarchean magmatism and Neoproterozoic high-grade metamorphism

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2014年第2期5卷 167-182页

作者： Toshiaki Tsunogae Daniel j.Dunkley Kenji Horie Takahiro Endo Tomoharu Miyamoto Mutsumi kato Graduate School of Life and Environmental Sciences University of Tsukuba Department of Geology University of Johannesburg Department of Applied Geology Western Australian School of Mines Curtin University National Institute of Polar Research Department of Earth and Planetary Sciences Faculty of Sciences Kyushu University Department of Earth Sciences Graduate School of Science Chiba University

We report new petrological data and geochronological measurements of granulites from Vesleknausen in the highest-grade section of the L＆#252;tzow-Holm Complex, part of the Gondwana-assembling collisional orogen in East Antarctica. The locality is dominated by felsic to intermediate orthogneiss （charnockite and minor biotite gneiss）, mafic orthogneiss, and hornblende-pyroxene granulite, with deformed and undeformed dykes of metagranite and felsic pegmatite. Pseudosection analysis of charnockite in the system NCKFMASHTO, supported by geothermometry of mafic orthogneiss, was used to infer peak metamorphic temperatures of 750e850 ？C, approximately 150 ？C lower than those estimated for met-asedimentary gneisses from Rundv？gshetta, 6 km to the northeast. SHRIMP U-Pb analysis of zircons from feldspar-pyroxene gneiss, which corresponds to a partially molten patch around mafic orthogneiss, yielded a Concordia upper intercept ages of 2507.9 ？ 7.4 Ma, corresponding to the time of formation of the magmatic protolith to the orthogneiss. Partial melting during peak metamorphism probably took place between 591 and 548 Ma, as recorded in rims overgrew around magmatic zircon. Our results suggest that Rundv？gshetta-Vesleknausen-Strandnibba region in southwestern L＆#252;tzow-Holm Bay, where orthogneisses are dominant, consists of a single crustal block, possibly formed by ca. 2.5 Ga arc mag-matism. The Neoarchean magmatic terrane was tectonically mingled with other fragments （such as metasedimentary units in northern L＆#252;tzow-Holm Bay） by subduction/collision events during the as-sembly of Gondwana supercontinent, and subsequently underwent w850 ？C granulite-facies meta-morphosed during Neoproterozoic to Cambrian final collisional event.

关键词： Granulite Charnockite SHRIMP zircon geochronology Pseudosection Rundvagshetta Gondwana supercontinent

An MAPK Pathway in Papilla Cells for Successful Pollination in Arabidopsis

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2020年第11期13卷 1539-1541页

作者： Yoshinobu kato Sota Fujii Laboratory of Bioorganic Chemistry Graduate School of Agriculture and Life SciencesThe University of Tokyo1-1-1 YayoiBunkyo-kuTokyo 113-8657Japan

During the pollination process in Brassicaceae,pollen and papilla cells at the tip of the pistil communicate with each other and trigger various physiological responses such as pollen hydration/germination and *** was thought that papilla cells drastically change their cellular environment to conduct water and calciumion release and to provide an energy source for pollen germination and pollen-tube elongation(Doucet et al.,2016).

关键词： Arabidopsis hydration release

Dynamic mechanical relaxation behavior of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2021年第24期83卷 248-255页

作者： L.T.Zhang Y.j.Duan T.Wada H.kato j.M.Pelletier D.Crespo E.Pineda j.C.Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Institute for Materials Research Tohoku UniversitySendai980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621Villeurbanne CedexFrance Department of Physics Barcelona Research Center in Multiscale Science and TechnologyInstitute of Energy TechnologiesUniversitat Politècnica de Catalunya08019BarcelonaSpain

Non-equiatomic high entropy bulk metallic glasses were reported recently and show unique mechanical and physical *** mechanical relaxation behavior of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass was investigated by dynamic mechanical analysis(DMA)and the mechanical spectra could be well described by the quasi-point defects(QPD)*** to typical metallic glasses,the intensity of theβrelaxation of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass is lower due to the sluggish *** the same time,the correlation factor is higher than that of conventional metallic glasses and this is ascribed to the high configuration *** parallel,physical aging below the glass transition temperature leads to a decrease of atomic mobility,caused by a decrease of the concentration of defects.

关键词： High entropy bulk metallic glass Mechanical relaxation Quasi-point defects Physical aging

Analysis of the anelastic deformation of high-entropy Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) metallic glass under stress relaxation and recovery

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2022年第12期107卷 82-91页

作者： Y.j.Duan L.T.Zhang T.Wada H.kato E.Pineda D.Crespo j.M.Pelletier j.C.Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarcelona 08019Spain Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621 Villeurbanne CedexFrance

The anelastic deformation behavior of Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass was probed by monitoring the stress relaxation and recovery processes. The stress relaxation under consecutive strain steps can be described by the Kohlrausch-Williams-Watts(KWW) function. In addition, considering a hierarchy of relaxation processes related to the structural heterogeneity, a constitutive model is proposed in order to describe the whole process of stress relaxation and determine the contribution of different time scales. Moreover, a crossover from stochastic activation to percolation of flow defects with the ultimate strain can be observed during stress relaxation process. The anelastic recovery process after a strain step is studied as a function of the initial strain level and characterized by means of a direct spectrum analysis. The peaks in the recovery time-spectra revealed the evolution of flow defects in Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass. The understanding of the atomic free-volume zones effect and the anelastic deformation provides important insight into how atomic structural features affect the deformation behavior of high-entropy metallic glasses, and may provide a new avenue into the improvement of their mechanical properties.

关键词： High-entropy metallic glass Stress relaxation Anelastic deformation Flow defects Free-volume zones

Diurnal and seasonal variations in light-use efficiency in an alpine meadow ecosystem:causes and implications for remote sensing

在线全文

学校读者我要写书评

暂无评论

journal of Plant Ecology 2009年第4期2卷 173-185页

作者： jin Chen Miaogen Shen Tomomichi kato State Key Laboratory of Earth Surface Processes and Resource Ecology Academy of Disaster Reduction and Emergency ManagementBeijing Normal UniversityBeijing 100875China Biological Environment Division National Institute for Environmental Studies16-2 OnogawaTsukubaIbaraki 305-8506Japan Research Institute for Global Change Japan Agency for Marine-Earth Science and TechnologyYokohamaKanagawa 236-0001Japan

Aims Light-use efficiency(LUE)is an important tool for scaling up local CO_(2)flux(F_(CO_(2)))tower observations to regional and global carbon *** a data set including F_(CO_(2))and environmental factors obtained from an alpine meadow on the Tibetan Plateau,we examined both diurnal and seasonal changes in LUE and the environmental factors controlling these *** objectives were to(i)characterize the diurnal and daily variability of LUE in an alpine meadow,(ii)clarify the causes of this variability,and(iii)explore the possibility of applying the LUE approach to this alpine meadow by examining the relationship between daily LUE and hourly LUE at satellite visiting *** First,we obtained the LUE—the ratio of the gross primary production(GPP)to the absorbed photosynthetically active radiation(APAR)—from the flux tower and meteorological *** then characterized the patterns of diurnal and seasonal changes in LUE,explored the environmental controls on LUE using univariate regression analyses and evaluated the effects of diffuse radiation on LUE by assigning weights through a linear programming method to beam photosynthetically active radiation(PAR)and diffuse PAR,which were separated from meteorological observations using an existing ***,we examined the relationships between noontime hourly LUE and daily LUE and those between adjusted noontime hourly and daily LUE because satellites visit the site only once or twice a day,near *** Findings The results showed that(i)the LUE of the alpine meadow generally followed the diurnal and seasonal patterns of solar radiation but fluctuated with changes in cloud cover.(ii)The fraction of diffuse light played a dominant role in LUE *** minimum temperature and vapor pressure deficit also affected LUE variation.(iii)The adjusted APAR,defined as the weighted linear sum of diffuse APAR and beam APAR,was linearly correlated with GPP on different temporal scales.(iv)Midd

关键词： light-use efficiency alpine meadow net ecosystem exchange Qinghai-Tibetan Plateau